I have a patient who has a hopeless #9, and the case was referred to me for slow extrusion of #9 prior to implant placement to augment the hard and soft tissues. I have done a number of these cases and have never had a problem. With this particular patient, using my normal mechanics (step downs on a round wire), tooth #9 is not moving at all. Rather, #10 is intruding. My first thought was that #9 is ankylosed (this tooth has undergone trauma, as well as periodontal surgery in which MTA was used near a fracture line on the root). However, the tooth is still clincially mobile. Could this be a "spot" ankylosis? The periodontist involved in the case has recommended luxation of the tooth and then re-trying the orthodontic extrusion. Does anyone out there have any ideas or suggestions? Thank you for your replies,